Mybatis批量更新和插入数据

batchUpdate

第一种方式

<update id="updateBatch" parameterType="Map">
update aa   set
a=#{fptm},
b=#{csoftrain}
where c in
<foreach collection="cs" index="index" item="item" pen="("separator=","close=")">
#{item}
</foreach>
</update>

但是这种方式修改的字段值都是一样的。

第二种方式

修改数据库连接配置：&allowMultiQueries=true

比如：jdbc:mysql://192.168.1.236:3306/test?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true

<update id="batchUpdate"  parameterType="java.util.List">

<foreach collection="list" item="item" index="index" open="" close="" separator=";">
update test
<set>
test=${item.test}+1
</set>
where id = ${item.id}
</foreach>

</update>

这种方式，可以一次执行多条SQL语句

batchInsert

1、mybatis的官方写法

public void batchInsert1(List<Poi> poilist) throws Exception {
SqlSession sqlSession = sqlSessionFactory.getObject().openSession(ExecutorType.BATCH);
PoiMapper pmapper = sqlSession.getMapper(PoiMapper.class);
try {
for (Poi poi : poilist) {
pmapper.insertPoi(poi);
}
sqlSession.commit();
} finally {
sqlSession.close();
}
}

其中Poi是一个bean。PoiMapper定义：

public interface PoiMapper {
@Insert("insert into tb_poi (tag, poi, poiid, meshid, owner, featcode, sortcode, namec, namee, namep, names) values (#{tag}, GeomFromText(#{point}), #{poiid}, #{meshid}, #{owner}, #{featcode}, #{sortcode}, #{namec}, #{namee}, #{namep}, #{names}) ")
public void insertPoi(Poi poi);
}

2、利用mysql特性，拼写insert sql。

public void batchInsert2(List<Poi> poilist) throws Exception {
SqlSession sqlSession = sqlSessionFactory.getObject().openSession(ExecutorType.BATCH);
try {
sqlSession.insert("com.emg.trans.mapper.batchMapper.batchInsert", poilist);
sqlSession.commit();
} finally {
sqlSession.close();
}
}

“com.emg.trans.mapper.batchMapper.batchInsert”在mybatis的xml中定义的sql，定义如下：

<mapper namespace="com.emg.trans.mapper.batchMapper">
<insert id="batchInsert" parameterType="List">
insert into tb_poi (tag, poi, poiid, meshid, owner, featcode, sortcode, namec, namee, namep, names) values
<foreach collection="list" item="poi" index="index" separator="," >
(#{poi.tag}, GeomFromText(#{poi.point}), #{poi.poiid}, #{poi.meshid}, #{poi.owner}, #{poi.featcode}, #{poi.sortcode}, #{poi.namec}, #{poi.namee}, #{poi.namep}, #{poi.names})
</foreach>
</insert>
</mapper>

3、利用spring的事务，直接执行插入操作。

@Transactional("dbTransaction")
public void batchInsert3(List<Poi> poilist) throws Exception {
for (Poi poi : poilist) {
apmapper.insertPoi(poi);
}
}

推荐 2 > 3 > 1

Spring-JDBC的三种实现

A、用spring事务执行插入操作

@Transactional("dbTransaction")
public void batchInsertJDBC1(List<Poi> poilist) throws DataAccessException {
String sql = "insert into tb_poi (tag, poi, poiid, meshid, owner, featcode, sortcode, namec, namee, namep, names) values (?, GeomFromText(?), ?, ?, ?, ?, ?, ?, ?, ?, ?)";
for (Poi poi : poilist) {
Object[] args = {poi.getTag(), poi.getPoint(), poi.getPoiid(), poi.getMeshid(), poi.getOwner(), poi.getFeatcode(), poi.getSortcode(), poi.getNamec(),
poi.getNamee(), poi.getNamep(), poi.getNames()};
jdbcTemplate.update(sql, args);
}
}

B、用spring事务和springjdbc的batchUpdate

@Transactional("dbTransaction")
public void batchInsertJDBC2(List<Poi> poilist) throws DataAccessException {
String sql = "insert into tb_poi (tag, poi, poiid, meshid, owner, featcode, sortcode, namec, namee, namep, names) values (?, GeomFromText(?), ?, ?, ?, ?, ?, ?, ?, ?, ?)";
List<Object[]> batchArgs = new ArrayList<Object[]>();
for (Poi poi : poilist) {
Object[] args = {poi.getTag(), poi.getPoint(), poi.getPoiid(), poi.getMeshid(), poi.getOwner(), poi.getFeatcode(), poi.getSortcode(), poi.getNamec(),
poi.getNamee(), poi.getNamep(), poi.getNames()};
batchArgs.add(args);
}
jdbcTemplate.batchUpdate(sql, batchArgs);
}

C、用spring事务，利用mysql特性，拼写insert sql

@Transactional("dbTransaction")
public void batchInsertJDBC3(List<Poi> poilist) throws DataAccessException {
StringBuffer sqlbuf = new StringBuffer()
.append("insert into tb_poi (tag, poi, poiid, meshid, owner, featcode, sortcode, namec, namee, namep, names) values ");
MessageFormat form = new MessageFormat("(''{0}'', GeomFromText(''{1}''), ''{2}'', ''{3}'', ''{4}'', ''{5}'', ''{6}'', ''{7}'', ''{8}'', ''{9}'', ''{10}''),");
for (Poi poi : poilist) {
Object[] args = {poi.getTag(), poi.getPoint(), poi.getPoiid(), poi.getMeshid(), poi.getOwner(), poi.getFeatcode(), poi.getSortcode(), poi.getNamec().replaceAll("'", "\\\\'"),
poi.getNamee().replaceAll("'", "\\\\'"), poi.getNamep().replaceAll("'", "\\\\'"), poi.getNames().replaceAll("'", "\\\\'")};
sqlbuf.append(form.format(args));
}
String sql = sqlbuf.toString();
sql = sql.substring(0, sql.length()-1);
jdbcTemplate.update(sql);
}

mybatis.1最慢。而且慢很多，很多。
mybatis.2很快。是mybatis中最快的。
mybatis.3比2慢一点。
jdbc.A比B稍快，两者差不多，和mybatis.3也在伯仲之间。
jdbc.C最快，比其他5种都快。

大排行，从用时少到用时多：jdbc.C < mybatis.2 < jdbc.A < jdbc.B , mybatis.3 << mybatis.1